Mixer



July 1, .1930. I M. GILSON I 1,768,595

MIXER Filed Dec. 22, 1926 I nun-mu QMZUMM [fir/m6! Gi/son Patented July I, 1930 v UNITED srA'rss MICHAEL GILSON, or roar WASHINGTON, --wrseonsrn-, .essrenon, *ro. Irwin-nix.

CONCRETE, MIXER, 00., or roar wasnineron, sconsin.

MIXER.

Application'filed December 22'; 1926 Serial 'No.' '1 56 ,401.

This invention relates to mixers, and is particularly directed to a meansof fastening the arms for the mixer blades to the shaft.

In mixers as heretofore constructed,particularly plaster mixers, it has been the uni versal custom to provide the arms with relatively large cast hubs which have to be secured to the shafts. These hubs are necessarily relatively large in order to provide for the passage of the shaft therethrough. In actual practice, these hubs collect the material and form knobs or balls of material of relatively large size which materially interfere with the efiicient Working of the mixer. I

This invention is designed to overcome the defects noted above, and objects of such invention are to provide a m xer 1n which the arms forthe mixing blades are secured to the shaft without the use of hubs and without any material enlargement at the shaft, and to provide such a construction that .the securing means itself strengthens the arms and forms in effect a reenforcement therefor.

Further objects are to provide an ex tremely simple type of device for'securing the arms to the shaft and one which may be most cheaply constructed and easily applied. 7

The latter feature noted above is of material importance when, for example, it is and remove it laterally from the shaft.

An embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 1s a fragmentary view of a portion of a mixer shaft and the associated arms and blades;

"2.:T2 offFigure 1;";

Referring tot-hedrawings, it-willi be seen Figure 2 is a sectional .view on'the line thatrthe mixer shaft is indijcated by thereference character 1-, and the mixing blades without departing from'the spirit ofi'this invention. I I

The blades 2tare formed ofsheet metal strap, as are the arms .73 which; extend radially from the shaft to the blades and are securely bolted to the blades,askindicated at 4'. The central or inner portions of the arms :3 are bowed outwardly to provide semi cylindrical parts 5 which enclose th'e sha'ft 1*,

as. shown most clearly in-Figure'Z, These Semibylindric'al parts continue outwardly and form short ears 3% A ipair of key piecesl-or key bars 6 are p'ositioned between the l arms 3 and the ears '3 and are securely Ybolted in :placeiby-means of bolts-7 passing through the arms and key-pieces and by 1neans:fof bolts. passing through the ears, I the key pieces,'and'the arms. It-is. to be noted that thelreypieces :pro-

jectinwardly oflthecylindrical portions 5 v and extend into key-ways 9 formed in-the shaftflthus: securely keying or locking the arms 3 to the shaft. It is to be noted fur-- ther that these key pieces strengthen the S 5" arms 3 at the point where they leave the shaft and, consequently, at the point where the greatest strain occurs.

It is to be distinctly understood that the key pieces may be formed double, but a single key piece may be used, if desired. However, in the form shown, the members 3 may be of identical'construction, and may be readily stamped and the double key piece insures the utmost security of attachment between the arms and the shaft.

These'mixers have heretofore been'constructed with relatively large cast iron hubs at the point where the shaft passes through the arms, and these hubs have had to be byythe reference character'Q. Theselmixing blades'may be=either straight or curvedas shown in the drawings, and in the :par.ticuflar-formrshown, are peculiarly adapted for. the mixing-of plaster, although of course, the mixer can be used for other purposes slipped upon the shaft and also from enlargements of a material size which collect plaster or other material and interfere with the efiicient operation of the device. It is clear that this invention overcomes these defects as itdoes not require the use of hubs at the points where the shaft passes through the arms. 1

the arms. Instead, there is very little ad ditional thickness over the diameter of the shaft at these points. Further than this, the arms themselves are greatly strengthened by this construction so that the key pieces not only serve to attach the arms rigidly to the shaft,but also have the ad ditional function of materially reenforcing It will be seen further that the parts may be most easily stamped or otherwise cheaply formed and may be placed in position and bolted securely with the utmost facility, and intheminimum time.

Although the invention has been described in considerable detail, such description is intended as illustrative rather than limiting as the invention may be variously embodied and as'the scope of such invention is to be determined as claimed.

I claim:

The combination of a shaft having diametrically opposecl key ways, a pair of arms having arcuate portions adjacent one end and adapted to embrace opposite sides of the shaft, with the shorter end of one arm lying parallel with the longer end of the other arm, flat key pieces having their inner ends engaged within the key ways and extending parallel with the arms, a pair of bolts extending through the long and short portion of the arms at one side of the shaft and through the key pieces, and a second pair of bolts extendingthrough the longer portion of each arm and through the key pieces adjacent the outer ends thereof.

In testimony that I claim the foregoing I have hereunto set my hand at Port Wash- 7 ington, in the county of Ozaukee and State of. Wisconsin.

MICHAEL GILSON. 

